https://github.com/square/certstrap/blob/fda01dbea1db250eabfe77a8ceef55232cd5a515/depot/depot.go#L116 It must be a minor mistype, however this actually allows looser permissions and prohibits stricter ones, instead of the opposite that we want. The corrent statement should be `if fi.Mode()&^tag.perm != 0 {`